<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>选项卡</title>
  <style type="text/css">
    .tab ul {
      overflow: hidden;
      padding: 0;
      margin: 0;
    }

    .tab ul li {
      box-sizing: border-box;
      padding: 0;
      float: left;
      width: 100px;
      height: 45px;
      line-height: 45px;
      list-style: none;
      text-align: center;
      border-top: 1px solid blue;
      border-right: 1px solid blue;
    }

    .tab ul li:first-child {
      border-left: 1px solid blue;
    }

    .tab ul li.active {
      background-color: orange;
    }

    .tab div {
      width: 500px;
      height: 300px;
      display: none;
      text-align: center;
      font-size: 30px;
      line-height: 300px;
      border: 1px solid blue;
      border-top: 0px;
    }

    .tab div.current {
      display: block;
    }
  </style>
</head>

<body>

  <div>
    <div class="app">
      <div class="tab">
        <ul>
          <li @click='handle(index)' :class='currentIndex===index?"active":""' v-for='(item,index) in list'
            :key='item.id'>{{item.title}}</li>
        </ul>
        <div :class='currentIndex===index?"current":""' v-for='(item,index) in list' :key='item.id'>
          <img :src=item.url>
        </div>
      </div>
    </div>
  </div>
  <script src="../js/vue.js"></script>
  <script>
    var vm = new Vue({
      el: '.app',
      data: {
        currentIndex: 0,
        list: [
          { id: 1, title: 'apple', url: '../images/apple.png' },
          { id: 2, title: 'orange', url: '../images/orange.png' },
          { id: 3, title: 'lemon', url: '../images/lemon.png' },
        ]
      },
      methods: {
        handle(index) {
          this.currentIndex = index
        }
      }
    })
  </script>
</body>

</html>